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Finding the Fourth Proportional to 235.98, 354.11 and 91.69

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Solution

The fourth proportional to 235.98, 354.11 and 91.69 is: 137.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    235.98 : 354.11 = 91.69 : x
  2. Step 2: Convert to fraction form
    235.98/354.11 = 91.69/x
  3. Step 3: Cross multiply
    235.98x = 354.11 × 91.69
  4. Step 4: Simplify right side
    235.98x = 32,467.00
  5. Step 5: Solve for x
    x = 32,467.00/235.98
  6. Step 6: Final answer
    x = 137.58

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.